1. Health and Environment Research Institute of Gwangju, Gwangju, Korea.
2. Kim Jang Hoon Eye Clinic, Gwangju, Korea.
3. Dr. Lee Eye Clinic, Gwangju, Korea.
4. St. Mary Eye Clinic, Gwangju, Korea.
5. Moo-Deung Eye Clinic, Gwangju, Korea.
6. Department of Microbiology, Chonnam National University School of Medicine, Gwangju, Korea.